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首页> 外文期刊>Aquatic Sciences >Habitat characteristics, temporal variability, and macroinvertebrate communities associated with a mat-forming nuisance diatom (Didymosphenia geminata) in Catskill mountain streams, New York
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Habitat characteristics, temporal variability, and macroinvertebrate communities associated with a mat-forming nuisance diatom (Didymosphenia geminata) in Catskill mountain streams, New York

机译：纽约卡茨基尔山区溪流中与形成垫层的有害硅藻（Didymosphenia geminata）相关的栖息地特征，时间变异和大型无脊椎动物群落

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摘要

Didymosphenia geminata has recently and rapidly greatly expanded its range and abundance, sometimes as an exotic invasive and other times as a nuisance ('native invader') within its hypothesized native range, including the northeastern United States. D. geminata mats are visually conspicuous and can grow ＞10 cm thick. Mats first appeared in the eastern Catskill mountains (New York) in 2009. Our objectives were to (1) document D. geminata growth in three impounded or regulated rivers in the eastern Catskill mountains from 2010 to 2012 and (2) measure the effects of D. geminata mats on macroinver-tebrates. The highest D. geminata cell densities were downstream of reservoir outflows in two of three streams. D. geminata mat development peaked in the summer each year, but maximum coverage and cell density was variable among years. D. geminata cover was negatively correlated with 10 days maximum antecedent shear stress, and the year with lowest mean D. geminata cover had multiple tropical storms and floods, suggesting that low variation in flow allows for D. geminata mat proliferation. Across sites, D. geminata density was negatively correlated with nitrate concentrations. D. geminata density was negatively related to macroinvertebrate richness suggesting that D. geminata mats may negatively affect aquatic food webs. D. geminata appears to be a nuisance species with similar habitat characteristics and growth where it is both a native invader and an invasive species.
机译：双鞭毛虫最近和迅速地大大扩展了其范围和丰度，有时甚至在其假想的原生范围内，包括美国东北部，作为外来入侵物种，有时又作为令人讨厌的事物（“本地入侵者”）。 D. geminata垫在视觉上很明显，可以长到10厘米以上。 Mats于2009年首次出现在东部的Catskill山区（纽约）。我们的目标是（1）记录2010年至2012年东部Catskill山区的三处蓄水或受管制河流中的D. geminata生长，以及（2）测量巨脊椎动物的D. geminata垫。双子叶菌最高细胞密度在三个流中的两个流中，在储层流出的下游。 D. geminata mat的发育在每年夏天达到顶峰，但是最大覆盖率和细胞密度在几年间是可变的。 D. geminata覆盖率与10天最大前期剪应力呈负相关，而D. geminata覆盖率平均值最低的年份有多次热带风暴和洪水，表明流量的低变化使D. geminata垫繁殖。跨站点，双子叶菌密度与硝酸盐浓度呈负相关。 D. geminata密度与无脊椎动物的丰富度负相关，这表明D. geminata垫可能会对水生食物网产生负面影响。 D. geminata似乎是具有相似栖息地特征和生长的滋扰物种，在这里它既是本地入侵者又是入侵物种。

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